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<div class="title">/data/users/hoss/faiss/IndexIVFSpectralHash.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * Copyright (c) Facebook, Inc. and its affiliates.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * This source code is licensed under the MIT license found in the</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> * LICENSE file in the root directory of this source tree.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// -*- c++ -*-</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="preprocessor">#include &quot;IndexIVFSpectralHash.h&quot;</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="preprocessor">#include &lt;memory&gt;</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="preprocessor">#include &quot;hamming.h&quot;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &quot;utils.h&quot;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &quot;FaissAssert.h&quot;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#include &quot;AuxIndexStructures.h&quot;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="preprocessor">#include &quot;VectorTransform.h&quot;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">namespace </span>faiss {</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;IndexIVFSpectralHash::IndexIVFSpectralHash (</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        Index * quantizer, <span class="keywordtype">size_t</span> d, <span class="keywordtype">size_t</span> nlist,</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;        <span class="keywordtype">int</span> nbit, <span class="keywordtype">float</span> period):</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;    IndexIVF (quantizer, d, nlist, (nbit + 7) / 8, METRIC_L2),</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    nbit (nbit), period (period), threshold_type (Thresh_global)</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;{</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1Index2Layer.html#a66403863c8ec987ed83b4d7ef4064fe9">code_size</a> % 4 == 0);</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    RandomRotationMatrix *rr = <span class="keyword">new</span> RandomRotationMatrix (d, nbit);</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    rr-&gt;init (1234);</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    vt = rr;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    own_fields = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a> = <span class="keyword">false</span>;</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;}</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;IndexIVFSpectralHash::IndexIVFSpectralHash():</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    IndexIVF(), vt(nullptr), own_fields(false),</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    nbit(0), period(0), threshold_type(Thresh_global)</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;{}</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;IndexIVFSpectralHash::~IndexIVFSpectralHash ()</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;{</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keywordflow">if</span> (own_fields) {</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;        <span class="keyword">delete</span> vt;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    }</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;}</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="keywordtype">float</span> median (<span class="keywordtype">size_t</span> n, <span class="keywordtype">float</span> *x) {</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    std::sort(x, x + n);</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="keywordflow">if</span> (n % 2 == 1) {</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        <span class="keywordflow">return</span> x [n / 2];</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        <span class="keywordflow">return</span> (x [n / 2 - 1] + x [n / 2]) / 2;</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;    }</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;}</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;}</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFSpectralHash.html#a47c66c0610e9e7e42e584f5560791707">   66</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html#a47c66c0610e9e7e42e584f5560791707">IndexIVFSpectralHash::train_residual</a> (<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span> *x)</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;{</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    <span class="keywordflow">if</span> (!vt-&gt;<a class="code" href="structfaiss_1_1VectorTransform.html#ab511f1ddf608c00204555881ca28cb02">is_trained</a>) {</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;        vt-&gt;<a class="code" href="structfaiss_1_1VectorTransform.html#a7350d4dd28d60866d55ba4f75d2da84c">train</a> (n, x);</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    }</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <span class="keywordflow">if</span> (threshold_type == Thresh_global) {</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;        <span class="comment">// nothing to do</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (threshold_type == Thresh_centroid ||</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        threshold_type == Thresh_centroid_half) {</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;        <span class="comment">// convert all centroids with vt</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        std::vector&lt;float&gt; centroids (nlist * d);</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        quantizer-&gt;reconstruct_n (0, nlist, centroids.data());</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        trained.resize(nlist * nbit);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        vt-&gt;<a class="code" href="structfaiss_1_1VectorTransform.html#a90f1a218c224c049f1bd8b77a78d6aa0">apply_noalloc</a> (nlist, centroids.data(), trained.data());</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keywordflow">if</span> (threshold_type == Thresh_centroid_half) {</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;            <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; nlist * nbit; i++) {</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;                trained[i] -= 0.25 * period;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;            }</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        }</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    }</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="comment">// otherwise train medians</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    <span class="comment">// assign</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    std::unique_ptr&lt;idx_t []&gt; idx (<span class="keyword">new</span> <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> [n]);</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    quantizer-&gt;assign (n, x, idx.get());</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    std::vector&lt;size_t&gt; sizes(nlist + 1);</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++) {</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        FAISS_THROW_IF_NOT (idx[i] &gt;= 0);</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        sizes[idx[i]]++;</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    }</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    <span class="keywordtype">size_t</span> ofs = 0;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; <a class="code" href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">nlist</a>; j++) {</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        <span class="keywordtype">size_t</span> o0 = ofs;</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        ofs += sizes[j];</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        sizes[j] = o0;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    }</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="comment">// transform</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    std::unique_ptr&lt;float []&gt; xt (vt-&gt;<a class="code" href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">apply</a> (n, x));</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    <span class="comment">// transpose + reorder</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    std::unique_ptr&lt;float []&gt; xo (<span class="keyword">new</span> <span class="keywordtype">float</span>[n * nbit]);</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++) {</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;        <span class="keywordtype">size_t</span> idest = sizes[idx[i]]++;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; nbit; j++) {</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;            xo[idest + n * j] = xt[i * nbit + j];</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;        }</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;    }</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    trained.resize (n * nbit);</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    <span class="comment">// compute medians</span></div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;<span class="preprocessor">#pragma omp for</span></div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;<span class="preprocessor"></span>    <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; <a class="code" href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">nlist</a>; i++) {</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;        <span class="keywordtype">size_t</span> i0 = i == 0 ? 0 : sizes[i - 1];</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;        <span class="keywordtype">size_t</span> i1 = sizes[i];</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j &lt; nbit; j++) {</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;            <span class="keywordtype">float</span> *xoi = xo.get() + i0 + n * j;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;            <span class="keywordflow">if</span> (i0 == i1) { <span class="comment">// nothing to train</span></div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;                trained[i * nbit + j] = 0.0;</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;            } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (i1 == i0 + 1) {</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;                trained[i * nbit + j] = xoi[0];</div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;            } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;                trained[i * nbit + j] = median(i1 - i0, xoi);</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;            }</div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;        }</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;    }</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;}</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;<span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;<span class="keywordtype">void</span> binarize_with_freq(<span class="keywordtype">size_t</span> nbit, <span class="keywordtype">float</span> freq,</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;                        <span class="keyword">const</span> <span class="keywordtype">float</span> *x, <span class="keyword">const</span> <span class="keywordtype">float</span> *c,</div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;                        uint8_t *codes)</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;{</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    memset (codes, 0, (nbit + 7) / 8);</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; nbit; i++) {</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        <span class="keywordtype">float</span> xf = (x[i] - c[i]);</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;        <span class="keywordtype">int</span> xi = int(floor(xf * freq));</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;        <span class="keywordtype">int</span> bit = xi &amp; 1;</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;        codes[i &gt;&gt; 3] |= bit &lt;&lt; (i &amp; 7);</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    }</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;}</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;};</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;</div>
<div class="line"><a name="l00161"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFSpectralHash.html#ab875c25aaf4fb2db0313b763c9294d64">  161</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html#ab875c25aaf4fb2db0313b763c9294d64">IndexIVFSpectralHash::encode_vectors</a>(<a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> n, <span class="keyword">const</span> <span class="keywordtype">float</span>* x_in,</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;                                          <span class="keyword">const</span> <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">idx_t</a> *list_nos,</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;                                          uint8_t * codes)<span class="keyword"> const</span></div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;<span class="keyword"></span>{</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    FAISS_THROW_IF_NOT (<a class="code" href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">is_trained</a>);</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    <span class="keywordtype">float</span> freq = 2.0 / period;</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;    <span class="comment">// transform with vt</span></div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    std::unique_ptr&lt;float []&gt; x (vt-&gt;<a class="code" href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">apply</a> (n, x_in));</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;<span class="preprocessor">#pragma omp parallel</span></div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;<span class="preprocessor"></span>    {</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;        std::vector&lt;float&gt; zero (nbit);</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;        <span class="comment">// each thread takes care of a subset of lists</span></div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;<span class="preprocessor">#pragma omp for</span></div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;<span class="preprocessor"></span>        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; n; i++) {</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;            <span class="keywordtype">long</span> list_no = list_nos [i];</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;            <span class="keywordflow">if</span> (list_no &gt;= 0) {</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;                <span class="keyword">const</span> <span class="keywordtype">float</span> *c;</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;                <span class="keywordflow">if</span> (threshold_type == Thresh_global) {</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;                    c = zero.data();</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;                } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;                    c = trained.data() + list_no * nbit;</div>
<div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;                }</div>
<div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;                binarize_with_freq (nbit, freq,</div>
<div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;                                    x.get() + i * nbit, c,</div>
<div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;                                    codes + i * <a class="code" href="structfaiss_1_1IndexIVF.html#a46d1aeddb60643c5b3f096147c3e028f">code_size</a>) ;</div>
<div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;            }</div>
<div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;        }</div>
<div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160;    }</div>
<div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;}</div>
<div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;</div>
<div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;<span class="keyword">namespace </span>{</div>
<div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;</div>
<div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;</div>
<div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">class</span> HammingComputer&gt;</div>
<div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160;<span class="keyword">struct </span>IVFScanner: <a class="code" href="structfaiss_1_1InvertedListScanner.html">InvertedListScanner</a> {</div>
<div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;</div>
<div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160;    <span class="comment">// copied from index structure</span></div>
<div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;    <span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html">IndexIVFSpectralHash</a> *index;</div>
<div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160;    <span class="keywordtype">size_t</span> code_size;</div>
<div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;    <span class="keywordtype">size_t</span> nbit;</div>
<div class="line"><a name="l00205"></a><span class="lineno">  205</span>&#160;    <span class="keywordtype">bool</span> store_pairs;</div>
<div class="line"><a name="l00206"></a><span class="lineno">  206</span>&#160;</div>
<div class="line"><a name="l00207"></a><span class="lineno">  207</span>&#160;    <span class="keywordtype">float</span> period, freq;</div>
<div class="line"><a name="l00208"></a><span class="lineno">  208</span>&#160;    std::vector&lt;float&gt; q;</div>
<div class="line"><a name="l00209"></a><span class="lineno">  209</span>&#160;    std::vector&lt;float&gt; zero;</div>
<div class="line"><a name="l00210"></a><span class="lineno">  210</span>&#160;    std::vector&lt;uint8_t&gt; qcode;</div>
<div class="line"><a name="l00211"></a><span class="lineno">  211</span>&#160;    <a class="code" href="structfaiss_1_1HammingComputer.html">HammingComputer</a> hc;</div>
<div class="line"><a name="l00212"></a><span class="lineno">  212</span>&#160;</div>
<div class="line"><a name="l00213"></a><span class="lineno">  213</span>&#160;    <span class="keyword">using</span> idx_t = <a class="code" href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">Index::idx_t</a>;</div>
<div class="line"><a name="l00214"></a><span class="lineno">  214</span>&#160;</div>
<div class="line"><a name="l00215"></a><span class="lineno">  215</span>&#160;    IVFScanner (<span class="keyword">const</span> <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html">IndexIVFSpectralHash</a> * index,</div>
<div class="line"><a name="l00216"></a><span class="lineno">  216</span>&#160;                <span class="keywordtype">bool</span> store_pairs):</div>
<div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;        index (index),</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;        code_size(index-&gt;code_size),</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;        nbit(index-&gt;nbit),</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;        store_pairs(store_pairs),</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;        period(index-&gt;period), freq(2.0 / index-&gt;period),</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;        q(nbit), zero(nbit), qcode(code_size),</div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;        hc(qcode.data(), code_size)</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;    {</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;    }</div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;    <span class="keywordtype">void</span> set_query (<span class="keyword">const</span> <span class="keywordtype">float</span> *query)<span class="keyword"> override </span>{</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;        FAISS_THROW_IF_NOT(query);</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;        FAISS_THROW_IF_NOT(q.size() == nbit);</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;        index-&gt;vt-&gt;apply_noalloc (1, query, q.data());</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;        <span class="keywordflow">if</span> (index-&gt;threshold_type ==</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;            IndexIVFSpectralHash::Thresh_global) {</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;            binarize_with_freq</div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;                (nbit, freq, q.data(), zero.data(), qcode.data());</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;            hc.set (qcode.data(), code_size);</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;        }</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    }</div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;    idx_t list_no;</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;    <span class="keywordtype">void</span> set_list (idx_t list_no, <span class="keywordtype">float</span> <span class="comment">/*coarse_dis*/</span>)<span class="keyword"> override </span>{</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;        this-&gt;list_no = list_no;</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;        <span class="keywordflow">if</span> (index-&gt;threshold_type != IndexIVFSpectralHash::Thresh_global) {</div>
<div class="line"><a name="l00246"></a><span class="lineno">  246</span>&#160;            <span class="keyword">const</span> <span class="keywordtype">float</span> *c = index-&gt;trained.data() + list_no * nbit;</div>
<div class="line"><a name="l00247"></a><span class="lineno">  247</span>&#160;            binarize_with_freq (nbit, freq, q.data(), c, qcode.data());</div>
<div class="line"><a name="l00248"></a><span class="lineno">  248</span>&#160;            hc.set (qcode.data(), code_size);</div>
<div class="line"><a name="l00249"></a><span class="lineno">  249</span>&#160;        }</div>
<div class="line"><a name="l00250"></a><span class="lineno">  250</span>&#160;    }</div>
<div class="line"><a name="l00251"></a><span class="lineno">  251</span>&#160;</div>
<div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;    <span class="keywordtype">float</span> distance_to_code (<span class="keyword">const</span> uint8_t *code) <span class="keyword">const</span> <span class="keyword">final</span> {</div>
<div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;        <span class="keywordflow">return</span> hc.hamming (code);</div>
<div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;    }</div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;    <span class="keywordtype">size_t</span> scan_codes (<span class="keywordtype">size_t</span> list_size,</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;                       <span class="keyword">const</span> uint8_t *codes,</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;                       <span class="keyword">const</span> idx_t *ids,</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;                       <span class="keywordtype">float</span> *simi, idx_t *idxi,</div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;                       <span class="keywordtype">size_t</span> k)<span class="keyword"> const override</span></div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;        <span class="keywordtype">size_t</span> nup = 0;</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; list_size; j++) {</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;            <span class="keywordtype">float</span> dis = hc.hamming (codes);</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;            <span class="keywordflow">if</span> (dis &lt; simi [0]) {</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;                maxheap_pop (k, simi, idxi);</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;                <span class="keywordtype">long</span> <span class="keywordtype">id</span> = store_pairs ? (list_no &lt;&lt; 32 | j) : ids[j];</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;                maxheap_push (k, simi, idxi, dis, <span class="keywordtype">id</span>);</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;                nup++;</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;            }</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;            codes += code_size;</div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;        }</div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;        <span class="keywordflow">return</span> nup;</div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;    }</div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    <span class="keywordtype">void</span> scan_codes_range (<span class="keywordtype">size_t</span> list_size,</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;                           <span class="keyword">const</span> uint8_t *codes,</div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;                           <span class="keyword">const</span> idx_t *ids,</div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;                           <span class="keywordtype">float</span> radius,</div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;                           RangeQueryResult &amp; res)<span class="keyword"> const override</span></div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;<span class="keyword">    </span>{</div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;        <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> j = 0; j &lt; list_size; j++) {</div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;            <span class="keywordtype">float</span> dis = hc.hamming (codes);</div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;            <span class="keywordflow">if</span> (dis &lt; radius) {</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;                <span class="keywordtype">long</span> <span class="keywordtype">id</span> = store_pairs ? (list_no &lt;&lt; 32 | j) : ids[j];</div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;                res.add (dis, <span class="keywordtype">id</span>);</div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;            }</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;            codes += code_size;</div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;        }</div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;    }</div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;</div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;</div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;};</div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;} <span class="comment">// anonymous namespace</span></div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;</div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;InvertedListScanner* <a class="code" href="structfaiss_1_1IndexIVFSpectralHash.html#a4d82b242a308783e53a350fc0064e062">IndexIVFSpectralHash::get_InvertedListScanner</a></div>
<div class="line"><a name="l00300"></a><span class="lineno"><a class="line" href="structfaiss_1_1IndexIVFSpectralHash.html#a4d82b242a308783e53a350fc0064e062">  300</a></span>&#160;    (<span class="keywordtype">bool</span> store_pairs) <span class="keyword">const</span></div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;{</div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;    <span class="keywordflow">switch</span> (code_size) {</div>
<div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;<span class="preprocessor">#define HANDLE_CODE_SIZE(cs) \</span></div>
<div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;<span class="preprocessor">    case cs: \</span></div>
<div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;<span class="preprocessor">        return new IVFScanner&lt;HammingComputer ## cs&gt; (this, store_pairs)</span></div>
<div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;<span class="preprocessor"></span>        HANDLE_CODE_SIZE(4);</div>
<div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;        HANDLE_CODE_SIZE(8);</div>
<div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;        HANDLE_CODE_SIZE(16);</div>
<div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;        HANDLE_CODE_SIZE(20);</div>
<div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;        HANDLE_CODE_SIZE(32);</div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;        HANDLE_CODE_SIZE(64);</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;<span class="preprocessor">#undef HANDLE_CODE_SIZE</span></div>
<div class="line"><a name="l00313"></a><span class="lineno">  313</span>&#160;<span class="preprocessor"></span>        <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00314"></a><span class="lineno">  314</span>&#160;            <span class="keywordflow">if</span> (code_size % 8 == 0) {</div>
<div class="line"><a name="l00315"></a><span class="lineno">  315</span>&#160;                <span class="keywordflow">return</span> <span class="keyword">new</span> IVFScanner&lt;HammingComputerM8&gt;(<span class="keyword">this</span>, store_pairs);</div>
<div class="line"><a name="l00316"></a><span class="lineno">  316</span>&#160;            } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (code_size % 4 == 0) {</div>
<div class="line"><a name="l00317"></a><span class="lineno">  317</span>&#160;                <span class="keywordflow">return</span> <span class="keyword">new</span> IVFScanner&lt;HammingComputerM4&gt;(<span class="keyword">this</span>, store_pairs);</div>
<div class="line"><a name="l00318"></a><span class="lineno">  318</span>&#160;            } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00319"></a><span class="lineno">  319</span>&#160;                FAISS_THROW_MSG(<span class="stringliteral">&quot;not supported&quot;</span>);</div>
<div class="line"><a name="l00320"></a><span class="lineno">  320</span>&#160;            }</div>
<div class="line"><a name="l00321"></a><span class="lineno">  321</span>&#160;    }</div>
<div class="line"><a name="l00322"></a><span class="lineno">  322</span>&#160;</div>
<div class="line"><a name="l00323"></a><span class="lineno">  323</span>&#160;}</div>
<div class="line"><a name="l00324"></a><span class="lineno">  324</span>&#160;</div>
<div class="line"><a name="l00325"></a><span class="lineno">  325</span>&#160;</div>
<div class="line"><a name="l00326"></a><span class="lineno">  326</span>&#160;</div>
<div class="line"><a name="l00327"></a><span class="lineno">  327</span>&#160;}  <span class="comment">// namespace faiss</span></div>
<div class="ttc" id="structfaiss_1_1HammingComputer_html"><div class="ttname"><a href="structfaiss_1_1HammingComputer.html">faiss::HammingComputer</a></div><div class="ttdef"><b>Definition:</b> <a href="hamming_8h_source.html#l00402">hamming.h:402</a></div></div>
<div class="ttc" id="structfaiss_1_1Index2Layer_html_a66403863c8ec987ed83b4d7ef4064fe9"><div class="ttname"><a href="structfaiss_1_1Index2Layer.html#a66403863c8ec987ed83b4d7ef4064fe9">faiss::Index2Layer::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">code_size_1 + code_size_2 </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFPQ_8h_source.html#l00221">IndexIVFPQ.h:221</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html">faiss::IndexIVFSpectralHash</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8h_source.html#l00031">IndexIVFSpectralHash.h:31</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html_a4d82b242a308783e53a350fc0064e062"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html#a4d82b242a308783e53a350fc0064e062">faiss::IndexIVFSpectralHash::get_InvertedListScanner</a></div><div class="ttdeci">InvertedListScanner * get_InvertedListScanner(bool store_pairs) const override</div><div class="ttdoc">get a scanner for this index (store_pairs means ignore labels) </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8cpp_source.html#l00300">IndexIVFSpectralHash.cpp:300</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_ad3f0d3071f987baabbdd3da4500c87ea"><div class="ttname"><a href="structfaiss_1_1Index.html#ad3f0d3071f987baabbdd3da4500c87ea">faiss::Index::idx_t</a></div><div class="ttdeci">long idx_t</div><div class="ttdoc">all indices are this type </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00062">Index.h:62</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html_a47c66c0610e9e7e42e584f5560791707"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html#a47c66c0610e9e7e42e584f5560791707">faiss::IndexIVFSpectralHash::train_residual</a></div><div class="ttdeci">void train_residual(idx_t n, const float *x) override</div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8cpp_source.html#l00066">IndexIVFSpectralHash.cpp:66</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_ab511f1ddf608c00204555881ca28cb02"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#ab511f1ddf608c00204555881ca28cb02">faiss::VectorTransform::is_trained</a></div><div class="ttdeci">bool is_trained</div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8h_source.html#l00040">VectorTransform.h:40</a></div></div>
<div class="ttc" id="structfaiss_1_1InvertedListScanner_html"><div class="ttname"><a href="structfaiss_1_1InvertedListScanner.html">faiss::InvertedListScanner</a></div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00272">IndexIVF.h:272</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_a7350d4dd28d60866d55ba4f75d2da84c"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#a7350d4dd28d60866d55ba4f75d2da84c">faiss::VectorTransform::train</a></div><div class="ttdeci">virtual void train(idx_t n, const float *x)</div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8cpp_source.html#l00078">VectorTransform.cpp:78</a></div></div>
<div class="ttc" id="structfaiss_1_1IndexIVFSpectralHash_html_ab875c25aaf4fb2db0313b763c9294d64"><div class="ttname"><a href="structfaiss_1_1IndexIVFSpectralHash.html#ab875c25aaf4fb2db0313b763c9294d64">faiss::IndexIVFSpectralHash::encode_vectors</a></div><div class="ttdeci">void encode_vectors(idx_t n, const float *x, const idx_t *list_nos, uint8_t *codes) const override</div><div class="ttdef"><b>Definition:</b> <a href="IndexIVFSpectralHash_8cpp_source.html#l00161">IndexIVFSpectralHash.cpp:161</a></div></div>
<div class="ttc" id="structfaiss_1_1Index_html_a6e92732617c4dbe364e7678dd8773a7f"><div class="ttname"><a href="structfaiss_1_1Index.html#a6e92732617c4dbe364e7678dd8773a7f">faiss::Index::is_trained</a></div><div class="ttdeci">bool is_trained</div><div class="ttdoc">set if the Index does not require training, or if training is done already </div><div class="ttdef"><b>Definition:</b> <a href="Index_8h_source.html#l00071">Index.h:71</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_af3b3a8bf95911f4b28128001c83f91a5"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#af3b3a8bf95911f4b28128001c83f91a5">faiss::VectorTransform::apply</a></div><div class="ttdeci">float * apply(idx_t n, const float *x) const </div><div class="ttdef"><b>Definition:</b> <a href="VectorTransform_8cpp_source.html#l00070">VectorTransform.cpp:70</a></div></div>
<div class="ttc" id="structfaiss_1_1Level1Quantizer_html_a1c4fc9d874d9492ee0ea27a5be388fa7"><div class="ttname"><a href="structfaiss_1_1Level1Quantizer.html#a1c4fc9d874d9492ee0ea27a5be388fa7">faiss::Level1Quantizer::nlist</a></div><div class="ttdeci">size_t nlist</div><div class="ttdoc">number of possible key values </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00033">IndexIVF.h:33</a></div></div>
<div class="ttc" id="structfaiss_1_1VectorTransform_html_a90f1a218c224c049f1bd8b77a78d6aa0"><div class="ttname"><a href="structfaiss_1_1VectorTransform.html#a90f1a218c224c049f1bd8b77a78d6aa0">faiss::VectorTransform::apply_noalloc</a></div><div class="ttdeci">virtual void apply_noalloc(idx_t n, const float *x, float *xt) const =0</div><div class="ttdoc">same as apply, but result is pre-allocated </div></div>
<div class="ttc" id="structfaiss_1_1IndexIVF_html_a46d1aeddb60643c5b3f096147c3e028f"><div class="ttname"><a href="structfaiss_1_1IndexIVF.html#a46d1aeddb60643c5b3f096147c3e028f">faiss::IndexIVF::code_size</a></div><div class="ttdeci">size_t code_size</div><div class="ttdoc">code size per vector in bytes </div><div class="ttdef"><b>Definition:</b> <a href="IndexIVF_8h_source.html#l00095">IndexIVF.h:95</a></div></div>
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